zeroinstall/injector/requirements.py

   1 """
   2 Holds information about what the user asked for (which program, version constraints, etc).
   3 """
   4
   5 # Copyright (C) 2011, Thomas Leonard
   6 # See the README file for details, or visit http://0install.net.
   7
   8 class Requirements(object):
   9         """
  10         Holds information about what the user asked for (which program, version constraints, etc).
  11         """
  12
  13         # Note: apps.py serialises our __slots__
  14         __slots__ = [
  15                 'interface_uri',
  16                 'command',
  17                 'source',
  18                 'before', 'not_before',
  19                 'os', 'cpu',
  20                 'message',
  21         ]
  22
  23         def __init__(self, interface_uri):
  24                 self.interface_uri = interface_uri
  25                 self.command = 'run'
  26                 self.source = False
  27                 self.before = self.not_before = None
  28                 self.os = self.cpu = None
  29                 self.message = None
  30
  31         def parse_options(self, options):
  32                 self.not_before = options.not_before
  33                 self.before = options.before
  34
  35                 self.source = bool(options.source)
  36                 self.message = options.message
  37
  38                 self.cpu = options.cpu
  39                 self.os = options.os
  40
  41                 # (None becomes 'run', while '' becomes None)
  42                 if options.command is None:
  43                         if self.source:
  44                                 self.command = 'compile'
  45                         else:
  46                                 self.command = 'run'
  47                 else:
  48                         self.command = options.command or None
  49
  50         def parse_update_options(self, options):
  51                 """Update the settings based on the options (used for "0install update APP").
  52                 @return: whether any settings were changed
  53                 @rtype: bool
  54                 @since: 1.9"""
  55                 changed = False
  56                 for key in ['not_before', 'before', 'message', 'cpu', 'os', 'command']:
  57                         value = getattr(options, key)
  58                         if value is not None:
  59                                 changed = changed or value != getattr(self, key)
  60                                 setattr(self, key, value)
  61                 if options.source and not self.source:
  62                         # (partly because it doesn't make much sense, and partly because you
  63                         # can't undo it, as there's no --not-source option)
  64                         from zeroinstall import SafeException
  65                         raise SafeException("Can't update from binary to source type!")
  66                 return changed
  67
  68         def get_as_options(self):
  69                 gui_args = []
  70                 if self.not_before:
  71                         gui_args.insert(0, self.not_before)
  72                         gui_args.insert(0, '--not-before')
  73                 if self.before:
  74                         gui_args.insert(0, self.before)
  75                         gui_args.insert(0, '--before')
  76                 if self.source:
  77                         gui_args.insert(0, '--source')
  78                 if self.message:
  79                         gui_args.insert(0, self.message)
  80                         gui_args.insert(0, '--message')
  81                 if self.cpu:
  82                         gui_args.insert(0, self.cpu)
  83                         gui_args.insert(0, '--cpu')
  84                 if self.os:
  85                         gui_args.insert(0, self.os)
  86                         gui_args.insert(0, '--os')
  87                 gui_args.append('--command')
  88                 gui_args.append(self.command or '')
  89
  90                 return gui_args